I got started by placing a sheet of sand paper onto the granite slab, turning the frame updside down in my hand, and sanding the top of the rails. This took a while, but I was able to knock off a couple of thousandths and get the rail height pretty close, or so I thought. I then turned the frame on its side and did the same thing to get the sides of the rails shaved down a bit. This was harder to do, and took more time.
I guess I started getting tired because I started to hurry. BIG mistake. I ended up forcing the slide a little too far onto the rails and it got stuck. After placing the frame in my bench vise and using a rubber mallet to remove the slide, I decided to take a break. At this point I also had shed some blood because I was gripping the sharp edges of the slide so tightly. Did I mention that this is actually relaxing?
You cannot bring too much firepower to a gunfight. However, unless the fight is choreographed by a Hollywood producer you can only fire one weapon at a time. Therefore, to carry on the fight if the weapon you are firing such as a shotgun fails for whatever reason, jams, or runs out of ammunition you need to transition to another firearm, a handgun for instance.
If your shotgun fails and you are within handgun range then it is better to sling your shotgun and engage the enemy with your pistol. This may give you time to fix the jam or to begin a combat reload. You cannot allow the aggressor to advance on your position as you fiddle with a jammed weapon. You need a sling to maintain control of the shotgun. If you do not have a sling, you have drop the weapon to engage properly with your handgun. You really do not want to give up control of the shotgun if it can be helped.
This is updated post about zeroing of the firearms.
You finally have the rifle out of the box and are anxious to shoot it. You cannot wait until you get to the range. Once there you set up the target, the silhouette at 25 meters looks close enough where you could throw a stone and hit it. You fire a round, scope it, and see that it missed the black. You try again and same placement. You move the weapon and find your shots are even farther from the black almost off the target completely. You blame the weapon and yourself. However, you may not realize that you have to adjust the weapon to you. The weapon may or may not have come from the factory with a mechanical zero or what some may call a battle sight zero. You have some adjustments to make.